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Reserved — this code is approved and frozen, but no production route can emit it yet. It is live today in the sandbox reference implementation — see the servers entry and x-sandbox extension in the spec.
Status: 503 field member: never present Source: route Reserved: fail-closed behavior for the future dock-command route’s own rate limiter/executor channel, mirroring the outbox drain’s fail-closed 503 pattern. Approved 2026-08-03; born live in the sandbox reference implementation (its fail-closed KV-unavailable path) — the production route is pending viam task 3.6.